Bands and artists that were good but now are trash

U2
The Cure
Paul McCartney vs. R.E.M.

Santana
Eric Clapton
Sting (being charitable about whether or not he was ever good. The Police had some decent songs, but Sting himself is absolute crap)

Rolling Stones
Pearl Jam
Weezer

Pink Floyd
Black Sabbath
Rolling Stones

good call on all three of those, Upquark

I'm with Uppy on this.

Steel Pulse(what happened man!)
Bob Marley (Now not the man but what his family has allowed to be remixed of his great work*cough when they were the wailers* -leave the legend alone without making Legend Dammit!)
Stevie Wonder( I love all the early work) But to quote Jack black " Is not better to burn out than fade away?"

Honorable mention- Julie, Filth & Sin ( Just teasin you there London )

Er... when were we ever good?

Madonna
Michael Jackson
Stone Temple Pilots

Green Day. I hate them with a passion, they were so cool back in the day.
Rod Stewart . Listen to the old Faces albums sometime. Compare to now. Throw up.
Carlos Santana . Been playing the same guitar solos for the last 35 years. No new ideas since 1970.

Some bands crash even faster. (See Franz Ferdinand)

Rolling Stones - good for seven years
Kool & the Gang - turned to shit in the 80s
Green Day - Shame

Metallica
Nickelback. No wait, they were always crap, sorry
Depeche Mode

Shania Twain- she should have stuck to Country music
Bryan Adams- I love his old stuff, the more rock stuff, hate all the ballads,

Ben Harper-His first three albums were genius, but lately they have been bland. But he has a new one coming out in a month (Other releases to look forward to:Granddaddy, Flaming Lips (incredible), Scissor Sisters, David Gilmore, Sonic Youth)